she is lossing weight and turning pale almost yellow but she is still walking around with the others also if it helps her earlobes are turning yellow i posted on here a few days ago about how my rooster got sick and died and i'm afraid she is coming down with the same thing what do i do

she is the one in the back i put this picture up to give you an idea of how pale she is she looked like the one in the front a few days ago please help
she is the one in the back i put this picture up to give you an idea of how pale she is she looked like the one in the front a few days ago please help